18413875505 has 4 divisors (see below), whose sum is σ = 22096650612. Its totient is φ = 14731100400.

The previous prime is 18413875483. The next prime is 18413875537. The reversal of 18413875505 is 50557831481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3137904289 + 15275971216 = 56017^2 + 123596^2 .

It is not a de Polignac number, because 18413875505 - 2¹² = 18413871409 is a prime.

It is a super-2 number, since 2×18413875505² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18413875505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1841387546 + ... + 1841387555.

It is an arithmetic number, because the mean of its divisors is an integer number (5524162653).

Almost surely, 2^18413875505 is an apocalyptic number.

It is an amenable number.

18413875505 is a deficient number, since it is larger than the sum of its proper divisors (3682775107).

18413875505 is an equidigital number, since it uses as much as digits as its factorization.

18413875505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3682775106.

The product of its (nonzero) digits is 672000, while the sum is 47.

The spelling of 18413875505 in words is "eighteen billion, four hundred thirteen million, eight hundred seventy-five thousand, five hundred five".